204478069 has 2 divisors, whose sum is σ = 204478070. Its totient is φ = 204478068.

The previous prime is 204478067. The next prime is 204478181. The reversal of 204478069 is 960874402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204347025 + 131044 = 14295^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 204478069 - 2¹ = 204478067 is a prime.

It is a super-2 number, since 2×204478069² = 83622561403937522, which contains 22 as substring.

Together with 204478067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204478063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102239034 + 102239035.

It is an arithmetic number, because the mean of its divisors is an integer number (102239035).

Almost surely, 2^204478069 is an apocalyptic number.

It is an amenable number.

204478069 is a deficient number, since it is larger than the sum of its proper divisors (1).

204478069 is an equidigital number, since it uses as much as digits as its factorization.

204478069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 204478069 is about 14299.5828260827. The cubic root of 204478069 is about 589.1360226144.

The spelling of 204478069 in words is "two hundred four million, four hundred seventy-eight thousand, sixty-nine".